After spending way too much time (and money in the swear jar) dealing with a 32-3 and now also a 35-3 with bad water pressure and leaking tanks the usual culprit is one or more pex screw-on fittings, which with age and new england winters easily cracks, letting air in and water out.
The most recent find being a cracked screw-on fitting at the bottom of the port water tank outlet on the 35-3, which was letting all tank water leak into the bilge.
I also found on both boats, which had lengthy periods of little or no use prior to my getting them, that the water manifolds got clogged with unearthly goo.
So replacing the water pump on my 32-3 turned out not to be necessary.
My simple solution is to cut the 1/2' OD pex (cuts easily) and sleeve over 1/2" ID hose with a replacement screw on fitting.
Hose here:
https://www.amazon.com/ID-50-Ft-Pre...07W5YZ55P&ref_=pd_basp_d_rpt_ba_s_4_pr_i&th=1
Fitting here:
https://www.amazon.com/Fittings-Thr...0B7RYGK4R/ref=cm_cr_arp_d_product_top?ie=UTF8
In my latest efforts, before finding the cracked fittings, I was preparing to just replace pex with the hose and fittings above in hard to access places by taping the hose to the pex to messenger it through and pulling the pex out altogeter.
A couple of pix below of the hose and fittings in action. Also the manifold that was clogged with goo so the od (and new) pump was not able to pull water from the tanks.